А + 5х = b + 2x
5x - 2x = b - a
3x = b - a
X = ( b - a ) / 3
X = 1/3( b - a )
(16c²-1)/(16c²-8c+1)=(4c+1)(4c-1)/(4c-1)(4c-1)=
=(4c+1)/(4c-1) , c≠1/4
3. y=-2.5x+7=x-2.8 f(x)=x-2.8
-5=2.5-b
b=2.5+5=7.5 f(x)=x-7.5 Графики во вложении
4. Т. пересечения (-4,-7) Графики во вложении
5.f(x)=-2x+5
(3,-4) -4=-2*3+b
b=-4+6=2 f(x)=-2x+2 Параллельна f(x)=-2x+5
6. y=-(x/3)+4/3
Точка (-2,2) |-2|=|2|
График во вложении
A = x.
b = x - 11.
a * b = 180
x * (x - 11) = 180
x² - 11x -180 = 0
D = 841
x₁ = (11 + 29)/2 = 20
x₂ = (11 - 29)/2 = -9
a₁ = 20 и a₂ = -9
b₁ = x - 11 = 9
b₂ = -20